Weirdly enough, when the VP44 injection pump was hanging up & failing on my '02 Cummins powered Ram pickup, 2T TCW-3 in the fuel at roughly 1 quart/30 gallons, or around 120:1, DID make a difference in how often the pump screwed up (it would stick in idle position in hot weather & take several attempts to accelerate before it broke loose & worked). I did eventually have it replaced by Dodge before the 100K warranty was up (after taking it to FIVE different dealers, a story for another day).